When it's time for that small window of opportunity here in the Red River Valley to finally dig dirt without breaking your spade or rototillar, and actually get the plants in the ground so they can blossom and fruit with some warm-ish weather to come, go to Hollands.
They have a wonderful selection of seeds, seedlings, and landscape supplies to help you get the job or pleasure, done. I've purchased tomato plantlings from there previously and all of them survived in abundance in spite of my black thumb!
They are located on the 75 HWY just before you enter Moorhead, and in the growing season for this area, you can find them easily enough by the white tent they put up to protect the plants in their little temporary greenhouse setting.
Holland also offers landscaping services if you have a need for those, or you can purchase the materials you need to make your yard to your specifications. You'll find a better pick going to a local nursery than you would from a chain or grocery store, and I recommend Holland.